The next day, the demon went to the post station and sent a letter to Zhao Laosan in Yangcheng. It's not that the demon skipped class, but the teacher informed the demon yesterday that there is no need to go to class today, and tomorrow.

In ancient times, official documents were delivered by post stations, which were used by people who passed official documents and military information or officials who traveled to and from the post station to eat and lodging and change horses. The post station is divided into three parts: post, station and shop. The post station is the transportation organization for the government to receive guests and arrange government materials. The station is an organization that transmits important documents and military information, and is dedicated to the military system. The shop is led by the local county, state and county government and is responsible for the delivery of official documents and letters. The shop is used to deliver official documents. All official documents exchanged between states and counties are transmitted by the delivery shop.

The post station is run by the government to send all kinds of information, but also to serve the people, as long as you pay, these post men can also do private work, earn a second income. Send the information of the official family first, and then send it to the private person, as long as it does not delay the official affairs. (Modern people know about fake public affairs, and ancient people also knew about it.) ）

Post stations are generally separated by 20 miles, and there are also separated by 30 miles, depending on the situation. Wearing a uniform, he also holds a bell that makes a special sound in his hand, and when he encounters a crowded place, he shakes the bell in the distance, and when he hears the sound of the bell, he knows that the stagecoach is coming, and he gives way, otherwise he deserves to be knocked down by the stagecoach. The poster rode a fast horse to a post station, and there were already other postcoaches waiting there, changing people and horses, and transmitting information day and night.

The message delivery is very fast and secure. If you want to be raided and destroyed, you can fight the post idea. During the war, there were also sentinels who specialized in the idea of a post boy or a post station to obtain information. It is possible to travel 500 miles in one day and one night to transmit information through post stations. It is said that there are 800 miles in a day and a night, this is a bit hanging, and the speed of people riding horses at night is definitely not as fast as during the day, and the fastest horse must be used to run the whole process, and it is necessary to keep changing people and horses.

There are three kinds of post stations, such as land post, water post and land and water merger, and each post station is equipped with post house, post ding, post horse, post boat and post field.

Cen Shen's "Judge Yuwen on the Way to Longshan for the First Time":

One post after another, the post ride is like a stream of stars.

Pingming Xianyang, twilight and Longshantou.

Longshui can't be heard, and the whimpering is sad.

The sand and dust are sweating, and the fog and dew are condensed mink.

Whoever comes to the west, he is a new marquis.

The month before the Anxi, there was no stop on the road.

Du Hu has not yet arrived, and he was in Xizhou when he came.

Ten days after the sand moraine, the wind will not stop.

The horse walked through the rubble, and all hooves were bleeding.

Serve the king for thousands of miles, and ask for nothing.

I also know that the wall is bitter, how can I seek it for my wife.

The mountain pass moon is about to come out, first take care of the castle tower.

The stream and the pine wind flutter in the quiet night.

Others rely on dreams, and the mountains are more worried.

Hand in hand with the son, do not worry about the road ahead.

The letter reads: "Uncle, I've already taken care of things. Send me my tattered and some of the second and third grade fine charcoal. The river can be bought with the mountains and tidal flats on the side. "The letter is very simple, and only the demon and Zhao Laosan can understand. The demon is afraid that the letter will fall into the hands of others and be caught.

The demon thought: "This Surabaya City has been here for more than a month, and I don't have time to visit it except in the academy and Yangcheng." Shop around today. ”

The demon walked around the city casually, and when he came to an information column, he saw that there were a lot of people watching, and there were many people crying.

The demon asked curiously, "What's going on?"

An insider replied: "The yamen has posted a notice, which contains a list of people killed in the war and missing people. Family members are looking for the names of their relatives. ”

The insider also quietly told the demon: "The battle ahead was lost, and many people died." More than 400 people were killed or missing in the city of Surabaya. ”

The demon also squeezed into the crowd to see. The notices were densely filled with names, and also explained that the families of the war dead could receive two taels of burial expenses, but the families of the missing could not receive it for the time being, and they could only receive it after three years when it was confirmed that they had no news.

On the battlefield, there were those who were killed, those who were captured, those who hid temporarily, and those who came back later. The main reason is that the dynasty implements a system of joint sitting. That is: if an officer dies in battle, all his direct subordinates who are one level shorter than him will be severely punished or even executed. In a big defeat, many middle and lower-ranking officers will definitely be killed or captured, and even high-ranking officers will be killed in battle. When some officers and soldiers saw that their superiors had died in battle, they knew that they would definitely be executed or severely punished when they returned, so they simply fled incognito and became Jianghu people, and even became bandits and robbers.

Looking at those sad and crying people, the demon was in a bad mood, and thought, "What can you do with two taels of silver?" Poor nameless riverside bones, like a person in a spring boudoir dream. ”

The demon walked to the market again, to the market where metal products were traded, and slowly strolled around. The demon has a hobby.,Like to collect rags.,It's not all rags.,Only items with aura.。 Because learning "The Retention and Sublimation of Mineral Aura" and "The Retention and Sublimation of Reiki in Alloy Casting" requires a large number of items with aura to practice. The demon walked around, bought a sword head with a broken sword with aura, without a sword handle, and spent 20 taels; a bowl with aura, split into two petals, is used by monks to eat, this is a bit heavy, it cost the demon 100 taels.

The demon has come to the Bird and Beast City again. The bird and beast market is a place to sell all kinds of living creatures, some are domestic, some are wild, some fly in the sky, and some run on the ground. The demon suddenly saw a little goose on the ground looking at him, this goose's legs and wings were tied, and he couldn't move. The demon heart moved: "It won't be another big rhubarb, little yellow or something." ”

The demon pointed to a big goose and asked the stall owner, "How much does this goose cost?"

The stall owner said, "1 tael." ”

The demon said, "What is it? A goose sells me for a tael." ”

The stall owner said, "It's wild." ”

The demon said, "I said it was made of gold." There are many wild creatures, and the wild ones are not so expensive, and 500 Wen is too expensive for me. ”

The stall owner's voice lowered: "400 Wen." ”

The demon pointed to the little goose that was tied up with five flowers and said, "Add that one, a total of 400 Wen." ”

The stall owner looked at the goose, which was too small, and agreed, and found a rope to tie the feet of the two geese, and told the demon to carry the goose back with the middle of the rope.

The demon paid 400 wen and carried the two geese home.

In the open space next to the wing of the demon kitchen, a bamboo fence was used to enclose it, and the goose was released. The demon untied the rope to the goose's wings and found that the rope had been pulled into the goose's wings, which was caused by struggle. The demon cut the rope, took out the rope, plucked some of the feathers from the wound on the goose's wings, cut it, and then drained the pus from the wound, poured a little gold sore powder on the goose's wound, and then cut the rope on the goose's legs, and let the goose gobly, thinking to himself: "This gold sore medicine can be used by everyone, and this goose can also be used." ”

The price of gold sore medicine is very expensive, and the point where the demon fell on the little goose is worth 5 taels. However, this golden sore medicine was snatched by the demon from the bandits' den, so it is not distressing to use.

The demon went back to the house and read the book.

The book "Identification of Alloy Minerals" is planned to identify one mineral every day.

"The Retention and Sublimation of Mineral Aura" and "The Preservation and Sublimation of Reiki in Alloy Casting" are not dramas now, so let's watch them later.

"Prospecting and Mining Technology" Demon turned it over in one day and finished it. Prospecting technology, first of all, to understand the minerals, based on the book "Identification of Alloy Minerals"; with the experience of the predecessors, plus luck, the experience of the predecessors summed up a few points: the minerals on the mountain and the surrounding plant ecology; the rock strata above to infer the various conditions underground, from the near rock strata to infer the various conditions in the distance; there is a certain interrelationship between the mineral deposits, and so on.

The demon saw that there was a certain correlation between the mineral deposits and the mineral deposits, and thought of the situation that the various metal mining areas in Yangcheng were very close to each other. "These things are only rote memorization, plus a lot of knowledge, that is, a lot of experience, you can understand it, and there is no learning skills. The demon thought to himself.

"Several Chapters of Guanzidi": The Yellow Emperor said: "If this is what you say, you can hear it?" Bo Gao said: "There is gold under the dansha, there is copper and gold under the stone, there is lead, tin, and red copper under the tomb stone, there is iron under the ochre, and the glory of this mountain is also."

On the surface of the mountain, there is a gold mine under Dansha, there is a copper mine under the surface of Cishi, there is lead, tin, and red copper under the surface of the mausoleum, and there is iron ore under the surface of the terracotta, all of which are the cases of ore seedlings on the mountain.

Mining technology, divided into open pit mining, underground mining.

"Wu Yue Chunqiu Lu Internal Biography": The cadres will make swords, pick the iron essence of the five mountains, and the golden Ying of the Liuhe.

"The Classic of Mountains and Seas": "The mountain of copper, 467 mountains, the mountain of iron, 3,609 mountains." "The numbers may not be credible, indicating that metal ores were already being mined at that time.

Open-pit mining is very simple, that is, the shallow layer is stripped and gradually carried out in depth and sectional comprehensive mining, horizontal mining, longitudinal mining, annular mining, and open-pit bottom flat mining.

Underground mining is complicated. Including shaft support, rock crushing, shaft ventilation, lighting, drainage, lifting, and beneficiation.

Support: no support, stone pillar support, wooden frame support, filling support

Rock crushing: tool crushing and fire crushing, the two methods are often used together.

Ventilation, lighting, lifting, drainage Ventilation As the excavation depth increases, ventilation measures must be taken to ensure smooth air circulation in the underground. The difference in the elevation of the wellhead of the vertical shaft is used to cause the pressure difference and form a natural air flow. With the continuous growth of the roadway, the ventilation method is changed from natural ventilation to manual ventilation, and the air volume increases. Use bellows and air cabinets to blow air, some dig gas wells and gas lanes, and some open gas wells and gas lanes, and use wind cabinets and bellows to blow air to solve the ventilation problem of deeper wells and lanes.

"Only rote memorization. If you go to the mines a little more, you will understand. The demon sighed.

Kong Pingzhong of the Song Dynasty said in "Tan Yuan": "Shaozhou Cen Water Field, copper hair in the past, digging more than 20 zhang to see copper. Today, the copper is less, and the digging is deeper, to seventy or eighty zhang. Servant Fuyun: There are many strange things in the ground, and people will die in the cold smoke. When the servant digs into the ground, he will try it first with a long bamboo tube end fire, such as the flame green, that is, the cold smoke, avoid it, do not go forward, but avoid. ”

Su Shi's "Dongpo Zhilin" in the Song Dynasty Volume 4: ○ Jinghe ◎ Tsujing Water Tatar Method

Shu went to the sea far away and took salt from the well. Lingzhou well is the most ancient, Shujing, Fushun salt is also long, but the well of Pujiang County, Qiongzhou, is opened by Wang Luan of the people of Xiangfu, and the profit is thick. Since the Qingli and Huangyou, Shu started to create "Tube Well", chisel with a round blade such as a bowl big, the deep one is dozens of zhang, go to the festival with a giant bamboo, and the peony is connected to the well, so as to separate the fresh water horizontally, then the spring is from the top. And the difference between the bamboo and the small one in and out of the well is the bucket, there is no bottom and the hole is on it, the ripe skin is hung a few inches, in and out of the water, the air is opened and closed from the breath, and a tube causes several buckets of water. All tube wells are mechanical, and everyone knows where the benefits are. The Book of the Later Han Dynasty has "water tassel", which is only used for iron smelting in Shu, which is roughly like a salt well water intake. The prince doesn't know it, and he understands it in vain.

This is the salt extraction method of salt wells.

(There are still such salt wells in Sichuan.) ）